Issue #39

Added test cases covering generalized RDF-star quads for producer and consumer include:

1. variety of triple terms for s/p/o in a generalized format, i.e., featuring BN/IRI/Literals/TT at any place, with graph label being of BN/IRI/Literal/Default graph
2. asserted statements along with quoted (same/similar content)
3. nesting up to 6 levels in s/p/o
4. repeating terms appearing in both acceptable and unacceptable places for using repeated values optimization (with negative tests for the consumer showing illegal repeated term usage in quoted triples)
5. multi-frame test for active lookup tables usage

The pos_001 set of quads follows the pattern of quads format:

TT - triple term, BN- blank node, L -literal (lt - langtag, dt - datatype), Def - default graph.